Abstract

Representatives of Tanidromitidae are known from the Middle Jurassic (Bajocian) to the Late Jurassic (Kimmeridgian). The genus Tanidromites comprises now eight species. Four of them are present in large numbers in Polish localities. The differences between all species are based upon new features of the anterior part of the carapace, distinguishing them in a transparent way. Their development is described. Distinguishing T. etalloni from T. insignis is based on new material and new characters.